Installation Instructions

WARNING : NEVER USE SOLVENTS !
Cleaners, gasoline, paint, sealants and other products may
contain strong solvents, such as acetone, which can attack many
plastics dramatically reducing their strength.
IMPORTANT : Please read the instructions completely before
proceeding with the installation. These directions supersede
instructions in your instrument manual if they differ.
INSTALLATION INSTRUCTIONS
17-129 rev. 06 3/99
Speed/Temperature Sensor with Valve
U.S. Patents: 4,898,029; 5,186,050. Australian Patent 605,281.
Canadian Patent 1,313,775. Japanese Patent 1851014
Models: S650 and ST650
Applications
• Plastic housings are recommended for fiberglass or metal hulls
only. Never mount a plastic thru-hull housing in a wood hull since
swelling of the wood may overstress the plastic causing a fracture.
• Bronze housings are recommended for fiberglass or wood hulls
only. Never mount a bronze housing in a metal hull because
electrolytic corrosion will occur.
• Stainless steel housings are recommended for metal hulls to
prevent electrolytic corrosion.
• Never install a metal housing on a vessel with a positive ground
system.
Tools and Materials Needed
Water-based or mineral spirits-based antifouling paint
( mandatory in salt water )
Safety goggles
Dust mask
Electric drill
Drill bit: 3mm or 1/8"
Hole saw: 51mm or 2"
Countersink tool for P217 and B119
[Available from Farallon Electronics: tel [phone], fax [phone]]
Mild household detergent or weak solvent (alcohol)
Sandpaper
Marine sealant
Additional washer for aluminum hull less than 6 mm (1/4") thick
slip-joint pliers for metal housing
Silicone grease or petroleum jelly (Vaseline

)
Zip-ties
For a cored fiberglass hull installation:
Hole saw for interior: 60mm or 2-3/8"
Fiberglass cloth and resin (see page 3, #5)
or Cylinder, wax, tape, and casting epoxy (see page 3, #5)
Preparation
Pre-test
Connect the sensor to the instrument and spin the paddlewheel. Check
for a speed reading and the approximate air temperature.
Antifouling Paint
Marine growth can accumulate rapidly on the sensor’s surface reducing
performance in weeks. Surfaces exposed to salt water must be coated
with antifouling paint. Use water - based or mineral spirits - based
antifouling paint only. Never use ketone-based paint, since ketones can
attack many types of plastic possibly damaging the sensor.
It is easiest to apply antifouling paint before installing the sensor, but allow
sufficient drying time. Reapply paint every 6 months or at the beginning of
each boating season. Paint the following surfaces (see Figure 1):
• Outside wall below the lower O-ring of the paddlewheel insert
• Paddlewheel cavity
• Paddlewheel
• Exterior lip of the housing and valve assembly
• Inside wall of the valve assembly up 30 mm (1-1/4")
• Blanking plug below the lower O-ring and the exposed end
Mounting Location
Turbulence-free water must flow over the paddlewheel at all boat speeds.
Choose an accessible spot with a minimum deadrise angle.
Allow a minimum of 28cm (11") of headroom inside the vessel for the
height of the housing, tightening the nuts, and removing the insert.
Figure 1. Antifouling paint
paddlewheel
cavity
paddlewheel
inside wall of
valve assembly exterior lip of housing
and valve assembly
outside wall below
lower O-ring
paddlewheel
up 30mm (1-1/4")
insert
housing